Unloader valve



FIG. 1 is a top-front-right perspective view of an unloader valve;

FIG. 2 is a top-front-left perspective view thereof;

FIG. 3 is a top-rear-right perspective view thereof;

FIG. 4 is a bottom-rear-right perspective view thereof;

FIG. 5 is a bottom-rear-left perspective view thereof;

FIG. 6 is a top-rear-left perspective view thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a rear elevation view thereof;

FIG. 9 is left elevation view thereof;

FIG. 10 is a right elevation view thereof;

FIG. 11 is a top plan view thereof; and,

FIG. 12 is a bottom plan view thereof.

The broken lines are included for the purpose of illustrating portions of the unloader valve that form no part of the claimed design. 

CLAIM The ornamental design for an unloader valve, as shown and described. 